More than half of those were reportedly for off-label uses such as treating attention deficit disorder and depression. In the Brain Stimulation Unit, a medical student turns on the juice under the watchful eye of Michael ­Koenig’s, the postbox running the experiment. I feel a slight tingle and an itch on my scalp as the current rises to 2.5 milliamps: a small amount, but enough to give a jolt. A couple of minutes later I have a metallic taste in my mouth. Koenig’s warned me this might happen. Hundreds of people have been tested, and this is one of the few side effects they’ve reported. ...

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Related Websites: DC Polarization of Bilateral Prefrontal Cortex (Electrical Stimulation) Prodigal In previous experiments on healthy people, Wassermann and others found that this procedure, called transcranial direct-current polarization, improved motor and cognitive performance. In one test, a direct current applied to the left frontal lobe boosted, by 20 percent, a person’s ability to name as many words beginning with a certain letter as possible in 90 seconds. Wassermann’s team is now testing electric

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fields with different charges against each other and against a sham, comparing subjects’ responses through tests that measure cognition, memory, and emotions. Direct current applied to the scalp polarizes underlying brain tissue, creating either a positive or a negative charge near the electrode. In vitro studies have shown that a weak current can substantially change the firing rate of neurons–with an increase or decrease in firing rate that depends on the orientation of the electric field. Evidence suggests

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that increases in firing enhance local brain function and decreases do the opposite. Zapping brains is not new. In the 1960s, low-level direct current was used to treat mental disorders, but investigators became more interested in chemical treatments until recently, when neuroscientists and clinicians began looking for targeted brain boosters with fewer side effects than pills. Wassermann thinks that one day we will

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be able to buy a tiny device that can be inserted into a hat or attached to a headband and turned on when we need a brain boost. My Brain, Altered I feel a slight uptick, like a medium hit of caffeine; it gently lifts the fog of my fatigue, though I don’t feel any smarter. I settle down to take some tests of cognition and emotion. Most telling is a gambling game that pre­sents four virtual decks of facedown

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cards on a computer screen; when I click on them, cards turn over, and I either win money or lose it, depending on the card. A ticker measures my winnings at the top of the screen. At first the cards seem random, but then patterns develop: I need to figure out which stacks will yield more gains than losses, and vice versa. After a few minutes, my initial mild boost dissipates. I lose at the gambling game, though not by much. The next morning I return after a good night’s sleep. Taking the gambling test sans